I agree with a lot of what you're saying, but as some have stated I feel that it's seen as casual content, and personally I would prefer it stay that way. It is nice to have dungeons you can simply go into, clear, get out and be done with it, without worrying about much hassle. However, I think what we could use is some high end dungeons. Instances created for a small group designed to challenge your skills and how well you know your class. Like Zepla HQ has stated on multiple occasions, something like a Mythic+ system from WoW, or just proper hard dungeons period.